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implementing of interface

 
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hi all,

We know that interface has only declaration of methods,
which we have to implement when a class implements a interface.
But there are some interfaces those do not have any method declaration like Cloneable, Serializable etc, but we have to implements such interfaces to perform an opration.

Why...why to implements those interfaces??
 
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The interfaces that you mentioned are referred to as marker interfaces. All they do is to indicate that an item is cloneable, or serializiable etc.

In your code you could check if something is cloneable by using the instanceof keyword.
 
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And before you ask further question about marker interfaces, please search through previous discussions on the subject by clicking the "Search" link at the top of the page. The subject has been discussed extensively many times.
 
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